Gp965 slip printer service manual jcm gold (h.K.) ltd. July, 98.
Gp-965 service manual 2 index 1. Overview 2. General precautions 3. Repair by unit replacement table 3-1 main units of gp-965 table 3-2 required measuring instruments table 3-3 surface phenomena for troubleshooting 3.1 the power switch is turned on but the printer doesn’t operate 3.2 the printer ope...
Gp-965 service manual 3 1. Overview because of the variety of symptoms that may occur according to the site of the problem, troubleshooting can be quite difficult. To simplify entry into the actual repair procedures, however, this chapter groups them into the two categories below: (1) repair by unit...
Gp-965 service manual 4 table 3-1 main units of gp-965 name unit no. Main circuit board refer to the gp-965 power supply board refer to the gp-965 ps panel sw circuit board m-290 printer mechanism part pricing list table 3-2 required measuring instruments designation standard tester dc voltage and r...
Gp-965 service manual 5 3.1 the power switch is turned on, but the printer doesn’t operate l check power supply y n n y n y n y y n n y start is the +24vdc output voltage normal? End is the ac input voltage normal? Check the contact of connector and ac switch is the fuse normal? Check the top224 reg...
Gp-965 service manual 6 l check main circuit board y n n y y n y n n y start input +24vdc to cn1.Then power led lights? Is the +5v voltage normal? Check the contact of all connectors trouble remedied? Replace the main circuit board trouble remedied? Replace the printer mechanism trouble remedied? En...
Gp-965 service manual 7 3.2 the printer operates but printing is abnormal y n n y y n y n y n start start the self test is the printing faint or missing dots? Any printing is performed? Check the contact of connector cn5 trouble remedied? Replace the main circuit board trouble remedied? Replace the ...
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Gp-965 service manual 9 3.3 paper feeding is abnormal n y n y y n n y start are cn5 and the m- 290 connector in proper contact? Replace the main circuit board trouble remedied? Replace the printer mechanism trouble remedied? End end correct the contact trouble remedied?.
Gp-965 service manual 10 3.4 the control panel doesn’t work properly n y n y y n start connector cn3 contact is normal? Replace the panel sw circuit board trouble remedied? Replace the main board end correct the contact trouble remedied? End.
Gp-965 service manual 11 4 repair on the unit level 4.1 main circuit board unit pheno- menon detail cause check repair- method abnormal +5v power supply faulty zener diode zd6,diodes d1,d3, and regulator u2(lm2575t-5.0) check the +5v supply voltage in pin4 of u2 replace zd6, d1, d3 and/or u2 abnorma...
Gp-965 service manual 12 abnormal driver/receiver in serial port faulty u4 check the signals at pin7~14 of u4 replace u4 the wrong characters are printed abnormal driver/receiver in parallel port faulty u5 check the signals at pin1~9 of u5 replace u5 4.2 panel sw circuit board unit phenomenon detail...
